According to some scholars (like Christian Gerlach) Germany largely adhered to the Geneva Convention when it came to other nationalities of prisoners of war.
[2] In the early phases of the war, following German occupation of much of Europe, Germany also found itself unprepared for the number of POWs it held, and released many (particularly enlisted personnel) on parole (as a result, it released all the Dutch, all Flemish Belgian, nine-tenths of the Poles, and nearly a third of the French captives).
[4]: 263–264 [3] At the start of World War II, the German Army was divided into 17 military districts (Wehrkreise), which were each assigned Roman numerals.
Some of these sub-camps were not the traditional POW camps with barbed wire fences and guard towers, but merely accommodation centers.
Post VE Day sending of German PoWs to Alaska, to dismantle war equipment http://www.sitnews.us/Kiffer/POWCamp/021715_prisoners_of_war.html